S.C. Code Ann. § 44-113-30
(A) Except as provided in this section and other provisions of this chapter, a health care provider may not refer a patient for the provision of designated health services to an entity in which the health care provider is an investor or has an investment interest. However, this prohibition does not apply to:
(2) the provider's investment interest is in registered securities purchased on a national exchange or over-the-counter market and issued by a publicly-held corporation:
(3) with respect to an entity other than a publicly-held corporation described in subsection (A)(2) and a referring provider's investment interest in the entity, each of the following requirements are met:
(B) With respect to an entity or to a publicly-held corporation in subsection (A)(2):